https://www.truck-manuals.net/mack/ INSTRUMENTS AND CONTROLS 61 11. Mode Button — Using this button will display diagnostic trouble code information and trip distance in the odometer. When you press and hold down this button, the display will go through a gauge self test. After the self test is complete, diagnostic trouble code information will be displayed, by MID, in the speedometer/odometer screen. When the first MID is displayed, push the Mode button again to display the 1st diagnostic trouble code for this MID. At the end of the diagnostic trouble code list for each MID, "CLEAR" will be displayed. You have the option here to clear the codes for this MID. If you choose to do so, press and hold the Mode button. Once the codes are cleared for this MID, the next MID will be displayed. By pressing this button once (NOT holding it down), information for Trip 1 distance will be displayed. Press and hold the Mode button to clear Trip 1 information. By pressing this button twice, information for Trip 2 distance will be displayed. Press and hold the Mode button to clear Trip 2 information. 12. Hour Meter — Indicates hours of engine operation. Hours of operation should be used as a guide for certain engine or PTO maintenance operations. 13. Optional Switch — See “Function of Optional Switches”, page 71. 14. Hand-Control Brake Lever (If Equipped) — Pull down to activate the trailer brakes, or the rear axle brakes in the case of a platform truck. Note: There are only two instances when the feature should be used: (1) momentary brake application at a stop sign, light, etc., or (2) to apply the trailer brakes while sliding a 5th wheel.
WARNING The hand-control brake system must NOT be used for parking. Do NOT use to apply service brakes while vehicle is in motion. Do not leave the vehicle while hand-control brake is applied.
15. Optional Switch — See “Function of Optional Switches”, page 71. 16. Optional Switch — See “Function of Optional Switches”, page 71. 17. Air Vent — Rotate the knob to open or close the air vent. 18. Cab Climate Control Panel — See the CAB CLIMATE CONTROL section for more information. 19. Fuel/ DEF Gauge— Registers the fuel and DEF levels in the supply tank(s).
